Differential Diagnosis for a Scab that Shows Up on Skin, Bleeds Daily, Itches, and Won't Go Away
- Single Most Likely Diagnosis
- Eczema (Atopic Dermatitis): This condition is characterized by itchy, inflamed skin that can bleed and form scabs. The daily bleeding and itching, along with the persistence of the scab, align with the symptoms of eczema, especially if the scab is scratched frequently, leading to further irritation and potential infection.
- Other Likely Diagnoses
- Psoriasis: An autoimmune condition that speeds up the life cycle of skin cells, causing cells to build up rapidly on the surface of the skin. The extra skin cells form scales and red patches that itch and bleed, which could be mistaken for a scab.
- Impetigo: A highly contagious skin infection that can cause red sores, scabs, and itchy skin. It often starts with a scratch or insect bite and can spread to other parts of the body.
- Seborrheic Dermatitis: A condition causing scaly patches, red skin, and stubborn dandruff due to an oily scalp. It can also occur on oily areas of the body, such as the face, and might present with itchy, bleeding scabs.
- Do Not Miss Diagnoses
- Skin Cancer (Basal Cell Carcinoma, Squamous Cell Carcinoma): Although less common, skin cancers can present as non-healing sores or scabs that bleed and itch. Early detection is crucial for effective treatment.
- Methicillin-Resistant Staphylococcus Aureus (MRSA) Infection: A type of bacterial infection that can cause skin lesions, including abscesses and scabs that may bleed and itch. MRSA infections require specific antibiotic treatments.
- Rare Diagnoses
- Dermatitis Herpetiformis: A skin condition characterized by blisters filled with a watery fluid, which can resemble scabs and are extremely itchy. It's associated with celiac disease and can be challenging to diagnose.
- Pyoderma Gangrenosum: A rare condition that causes tissue to become necrotic, leading to deep ulcers that can look like scabs and are often painful and itchy. It can be associated with systemic diseases.
Each of these diagnoses has distinct features, but the presentation can sometimes overlap, making a thorough medical evaluation necessary for an accurate diagnosis and appropriate treatment.