Diagnostic Tests for Leg rash

Diagnostic Test list for Leg rash:

The list of diagnostic tests mentioned in various sources as used in the diagnosis of Leg rash includes:

• Skin examination
  • Note characteristics of skin rash - e.g. macular, papular, pustular, vesicular, bullous, scaly, ulcers - will help determine the cause of the leg rash (e.g. a macular or papular rash may suggest eczema, contact dermatitis, exfoliative dermatitis or a drug reaction; a pustular rash may suggest staphylococcus, scabies or a fungal skin infection; a vesicular or bullous rash may suggest chicken pox, dermatitis herpetiformis, contact dermatitis, bullous impetigo or nummular eczema; a scaly rash may suggest ichthyosis, psoriasis, fungal skin infection, exfoliative dermatitis or a drug eruption; an ulcerative rash may suggest a basal cell carcinoma).
  • Note distribution of the skin affected - e.g. focal or diffuse (e.g. focal rash may suggest fungal skin infection, scabies, contact dermatitis, skin tumor, nummular eczema or impetigo; diffuse rash may suggest psoriasis, eczema, drug eruptions or dermatitis herpetiformis.
  • If the rash is on other parts of the body, what areas of the body does it primarily involve - e.g. extremities, face, trunk? - will help determine the cause (e.g. extremities may suggest atopic dermatitis, tinea, psoriasis or insect bites).
• Blood tests
  • Radioallergosorbent testing (RAST) - to test for specific allergens that may be triggering eczema ( 90% relevant if negative, but only 20% relevant if positive).
• Skin tests
  • Microscopic examination of scrapings of any skin burrows to detect scabies mite or skin rash to rule out fungal infection
  • Patch testing to detect skin allergies
  • Punch or shave skin biopsy
• Swab of any discharge - for bacteria, fungi or virus.

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