Differential Diagnosis for Red Raised Scaly Patches on Skin
Single Most Likely Diagnosis
- Psoriasis: This is the most likely diagnosis due to the characteristic presentation of red, raised, scaly patches, which are hallmarks of psoriatic plaques. Psoriasis is a common chronic skin condition that can appear anywhere on the body.
Other Likely Diagnoses
- Eczema (Atopic Dermatitis): Eczema can present with red, raised, and scaly patches, especially in individuals with a history of allergies or asthma. The distribution and morphology can vary, making it a plausible differential.
- Seborrheic Dermatitis: This condition causes scaly patches, red skin, and stubborn dandruff, often on oily areas of the body like the face. It's a common condition that could fit the description given.
- Contact Dermatitis: An allergic reaction or irritation from substances like soap, detergent, or certain metals can cause red, itchy, and scaly skin. The history of exposure to new products or environments can support this diagnosis.
Do Not Miss Diagnoses
- Lupus: Systemic lupus erythematosus (SLE) can cause a variety of skin rashes, including those that are red, raised, and scaly. Missing this diagnosis could lead to significant morbidity due to the systemic nature of lupus.
- Dermatomyositis: This is an inflammatory disease characterized by skin rash and muscle weakness. The skin manifestations can include red, scaly patches, and it's crucial not to miss this diagnosis due to its association with underlying malignancy in some cases.
- Sarcoidosis: This condition can cause skin lesions that are red, raised, and scaly, among other systemic symptoms. It's essential to consider sarcoidosis due to its potential to affect multiple organ systems.
Rare Diagnoses
- Pityriasis Rubra Pilaris (PRP): A rare skin disorder characterized by constant scaling, redness, and thickening of the skin. While rare, it's an important consideration in the differential diagnosis due to its distinct clinical features.
- Parapsoriasis: A group of rare skin disorders that can present with red, scaly patches. These conditions are less common but should be considered in cases where more common diagnoses have been ruled out.
- Cutaneous T-Cell Lymphoma (CTCL): This includes conditions like mycosis fungoides, which can present with skin patches that are red, raised, and scaly. Given the potential for malignancy, it's a critical, albeit rare, diagnosis to consider.