Itchy Bumps on Wrists & Legs: Differential Diagnosis

Pruritic Papules on Wrists and Lower Legs: Clinical Differential

Small itchy bumps in these distributions suggest specific etiologies. Distribution, morphology, and history narrow the diagnosis.

Top Differential Diagnoses

Diagnostic Approach

1. History: Onset, progression, exposures, medications, atopy, contacts, travel
2. Exam: Distribution, morphology, burrows, mucosal/nail involvement, dermoscopy
3. Tests:
   • Skin scraping + KOH (scabies, fungal)
   • Biopsy (lichen planus, DH, prurigo, unclear)
   • Patch testing (contact allergy)
   • Serology: Celiac panel (DH), HIV (eosinophilic folliculitis)

Symptomatic Relief (While Diagnosing)

• Cool compresses, colloidal oatmeal baths
• Topical corticosteroids (potency by site: low face/genitals, high palms/soles)
• Oral antihistamines (sedating at night: hydroxyzine, doxepin)
• Emollients barrier repair
• Avoid scratching (trim nails, cotton gloves at night)

When to See a Dermatologist

• No improvement with OTC measures in 2 weeks
• Spreading, worsening, signs of infection (honey crust, spreading erythema)
• Systemic symptoms (fever, joint pain, weight loss)
• Mucosal/genital/nail involvement
• Immunocompromised

Wrist + ankle distribution strongly suggests contact dermatitis (watch/socks), scabies, lichen planus, or insect bites. Dermoscopy is highly valuable.

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Condition	Typical Distribution	Morphology	Key Features
Insect bites (mosquito, flea, bedbug, mite)	Exposed: ankles, wrists, waist	Erythematous papules, central punctum	Seasonal, clustered, "breakfast-lunch-dinner" (fleas/bedbugs)
Scabies (Sarcoptes scabiei)	Wrists, web spaces, waist, genitals	Burrows (pathognomonic), papules, nodules	Nocturnal itch; contacts affected; burrow ink test
Contact dermatitis (allergic/irritant)	Watch band (wrist), sock line (ankle)	Erythema, vesicles, scaling, lichenification	History of exposure (nickel, rubber, adhesives, plants)
Atopic dermatitis (eczema)	Flexural, but wrists/ankles common	Lichenified plaques, excoriations	Personal/family atopy; chronic relapsing
Lichen planus	Wrists (volar), ankles, shins	Violaceous, polygonal, flat-topped papules (Wickham striae)	Koebner; oral mucosa, nails, genital involvement
Psoriasis	Extensor: elbows, knees, shins	Salmon-pink plaques, silvery scale	Auspitz sign; nail pitting; joint involvement
Dermatitis herpetiformis	Elbows, knees, buttocks, scalp	Grouped vesicles/papules, intensely itchy	Celiac association; IgA deposits on DIF
Prurigo nodularis	Extensor limbs	Hyperkeratotic nodules from chronic scratching	Neurogenic; refractory
Drug eruption	Generalized, can start acral	Morbilliform, urticarial, fixed drug eruption	Temporal relation to new medication