Differential Diagnosis for Dry Rash in Axilla
- Single most likely diagnosis
- Contact dermatitis: This is a common condition that occurs when the skin comes into contact with an irritant or allergen, leading to a dry rash. The axilla is a frequent site for contact dermatitis due to friction, sweat, and potential allergens in antiperspirants or clothing.
- Other Likely diagnoses
- Eczema (atopic dermatitis): A chronic skin condition characterized by dry, itchy, and inflamed skin. The axilla can be an affected area, especially in individuals with a history of atopic dermatitis.
- Intertrigo: A skin condition caused by friction and moisture in skin folds, leading to a rash. The axilla is a common site for intertrigo, especially in warm weather or in individuals who are overweight.
- Seborrheic dermatitis: A condition causing scaly patches, red skin, and stubborn dandruff, often affecting oily areas of the body like the axilla.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Lymphoma (cutaneous T-cell lymphoma): Although rare, cutaneous T-cell lymphoma can present with skin lesions or rashes in unusual locations, including the axilla. Early diagnosis is crucial for effective treatment.
- Invasive fungal infections: In immunocompromised individuals, fungal infections like histoplasmosis or cryptococcosis can cause skin lesions. These conditions are life-threatening and require prompt diagnosis and treatment.
- Rare diagnoses
- Pityriasis rosea: A skin condition characterized by a rash that can appear in the axilla, although it more commonly affects the trunk.
- Psoriasis: An autoimmune condition that can cause dry, scaly patches on the skin, including in the axilla, though it's less common in this area compared to elbows, knees, or scalp.