CO Esthetician common mistakes
CO Esthetician · Understand the traps and how to avoid them.
Treating disinfection as interchangeable with sanitation and sterilization - for example, wiping a table with a low-level cleaner and calling the station ready, or describing an implement as 'sterilized' after soaking in a quat solution.
Everyday salon language blurs the three tiers, and candidates study them as one vocabulary list instead of a hierarchy tied to the object and the situation. The exam deliberately asks which level applies to a given item or event, so a fuzzy mental model collapses under scenario wording.
What to do instead
Build a three-column table - sanitation, disinfection, sterilization - and place each real item in it: work surfaces, capes, brushes, metal tweezers, nippers, lancets, porous vs. nonporous. For each, memorize the required agent, contact time, and whether the item is single-use. Practice by reading a scenario and first naming the object's classification before choosing the level.
Skipping the contact time and concentration details on disinfectant labels, and answering questions about mixing or storing solutions from habit rather than from label directions.
In the treatment room, product is often pre-mixed and topped up, so the candidate never internalizes dilution ratios or wet-contact minutes. Exam items test exactly those parameters because they determine efficacy.
What to do instead
Memorize the principle that EPA-registered hospital-grade disinfectants must be used at label dilution for the full label contact time, and that containers must be labeled and covered, with solutions changed per manufacturer direction. Study the difference between cleaning (removing visible debris) and disinfecting (killing pathogens on a pre-cleaned surface) as a required sequence, not alternatives.
Confusing the layers and cell turnover of the epidermis - misplacing the stratum lucidum, mixing up which layer contains Langerhans or Merkel cells, or stating an incorrect epidermal turnover time.
Layer names look similar and are learned visually from diagrams; without a functional anchor the candidate memorizes order but not what each layer does, so questions framed around function rather than position defeat them.
What to do instead
Learn each layer by its job and its distinguishing feature: basal layer as the mitotic source with melanocytes, spinous layer with desmosomes, granulosum with keratohyalin and the water barrier, lucidum as the clear layer of thick skin only, corneum as the shedding barrier. Attach the keratinocyte journey and its approximate four-week turnover to that sequence so the order is reconstructed, not recited.
Mixing up skin types with skin conditions - labeling dehydration, sensitization, or acne as a 'skin type', or recommending the same protocol for oily skin and oily-but-dehydrated skin.
Intake forms and retail language use 'type' loosely, and candidates carry that looseness into analysis questions. The exam separates the two because treatment decisions depend on the distinction.
What to do instead
Drill a two-part analysis: first classify type (normal, dry, oily, combination) using the T-zone and overall oil assessment, then list conditions (dehydration, sensitivity, hyperpigmentation, aging, acne) separately. For every practice client, write the type and the conditions on separate lines and justify each with an observed indicator such as pore size, shine, flaking, or reactivity.
Describing lesions and disorders with casual terms instead of correct classifications, and failing to recognize which findings are contraindications requiring referral rather than treatment.
Candidates focus on product knowledge and treat skin analysis as a step to get through quickly. They also fear appearing unhelpful, so they default to 'we can treat that' instead of recognizing scope limits.
What to do instead
Memorize a short contraindication list with visual cues: suspected malignancy (asymmetry, irregular border, varied color, evolving), undiagnosed lesions, active infection or cold sores, open or broken skin, recent chemical peel or laser, and contagious conditions. Practice scripting a referral sentence and a service-decline sentence so the correct behavior is automatic.
Treating massage movements as a sequence to memorize rather than a purpose-driven progression, and applying stimulating movements at the wrong point in the facial or with the wrong pressure for the client's condition.
Practical practice emphasizes choreography and timing, so candidates learn order without the rationale. Exam items ask which movement is indicated or contraindicated for a given skin condition or goal.
What to do instead
Learn each movement by its physiological effect and its place in the service: effleurage for relaxation and product distribution, petrissage for deeper tissue work, tapotement as stimulating and generally avoided on sensitive or couperose skin, and friction as directional. Map a standard progression from cleansing through massage to masking and finishing, and state the purpose aloud at each step.
Underestimating exfoliation variables - recommending a strong physical scrub or high-percentage acid on reactive, recently treated, or acne-inflamed skin, or ignoring how frequency compounds effect.
Candidates equate more exfoliation with better results because that is the marketing narrative, and they learn ingredients by name rather than by mechanism and caution.
What to do instead
Study exfoliation as two mechanisms - mechanical (scrubs, brushes) and chemical (AHA, BHA, enzymes) - and attach a caution to each: no mechanical scrub over active acne or broken skin, AHA increases photosensitivity, BHA is lipid-soluble and suited to congested pores, and frequency must be spaced. Build a short list of absolute contraindications and be able to justify each with the mechanism.
Answering waxing questions from temperature feel rather than from testing protocol, and treating contraindications such as isotretinoin use, recent exfoliation, or compromised skin as negotiable.
In practice, wax is often judged by hovering the stick and by client tolerance, and clients push back on refusals. Candidates absorb that pragmatism and then miss exam items that test hard rules.
What to do instead
Memorize the safe-temperature test on the inner wrist and the rule that wax should never be reheated beyond manufacturer guidance or applied over double-dipped contamination. Build a written contraindication checklist - prescription retinoids and isotretinoin, recent peels or dermabrasion, sunburn, varicose veins, moles and raised lesions, diabetes-related or circulatory compromise - and rehearse a refusal script for each.
Ignoring ingredient function and interaction - treating 'natural' or 'hypoallergenic' as safety guarantees, and failing to predict how an acid, a retinoid, and an exfoliant interact in one regimen.
Retail training rewards ingredient-name recall and label claims, while the exam tests function, pH, and compatibility. Candidates also assume natural means non-irritating.
What to do instead
Build an ingredient card for each key category - humectant, emollient, occlusive, surfactant, AHA, BHA, enzyme, retinoid, antioxidant, sunscreen active - listing function, typical caution, and incompatibilities. Explicitly note that botanical and essential-oil ingredients can sensitize and that 'natural' and 'hypoallergenic' are marketing terms, not regulatory guarantees.
Answering Colorado law and ethics items from general salon custom rather than from the specific scope, licensure, and sanitation rules - for example, assuming a license transfers automatically or that a lash or brow service falls outside esthetician scope.
Candidates learn statutes once in school and then rely on workplace habit. Rules also change, and secondhand summaries circulate in studios, so the candidate's working belief diverges from the current rule.
What to do instead
Rebuild your knowledge from the primary source: the Colorado Office of Barber and Cosmetologist Licensing and the current statute and rules governing licensure, scope of practice, sanitation standards, and display of license. Write a one-page summary in your own words covering licensure and renewal, scope boundaries, and prohibited practices, then verify each line against the official text. For ethics, memorize the duties around informed consent, confidentiality, honest advertising, and declining services beyond scope.