Skin Assessment & Common Skin Disorders

That rash could be contact dermatitis, cellulitis, or early shingles — and each demands a completely different nursing response. Your systematic skin assessment is what separates them.

A thorough skin assessment uses inspection and palpation across all body surfaces, including skinfolds, behind ears, between toes, and mucous membranes. Document findings using the ABCDE framework for pigmented lesion/mole evaluation: Asymmetry, Border irregularity, Color variation, Diameter >6 mm, and Evolving characteristics — this flags melanoma risk. Describe lesions precisely by type: macules are flat and <1 cm, papules are raised and <1 cm, vesicles are fluid-filled and <1 cm, bullae are fluid-filled and >1 cm, and wheals are transient raised areas seen in urticaria. Common disorders to recognize include contact dermatitis (localized erythema with clear margins matching an irritant pattern), cellulitis (unilateral warmth, erythema, edema with poorly defined borders and possible fever), herpes zoster (painful vesicular rash following a single dermatome, unilateral), and psoriasis (silvery-white plaques on extensor surfaces). Skin turgor assessed at the sternum or clavicle in older adults — the hand dorsum is unreliable due to age-related elasticity loss. Color changes matter: cyanosis in dark-skinned patients is assessed in oral mucosa, conjunctivae, and nail beds, not the extremities.

Key Distinctions

Don't confuse cellulitis (spreading infection, poorly defined borders, systemic signs) with contact dermatitis (localized, sharply demarcated, follows exposure pattern). Students mix up vesicles (<1 cm, as in shingles) with bullae (>1 cm, as in pemphigus) — size is the only distinction. Herpes zoster is always unilateral and dermatomal; bilateral vesicular rash suggests a different etiology.

Clinical Pearl

ABCDE is for moles, but think 'dermatomal and unilateral' for shingles — if vesicles cross the midline, rethink the diagnosis.