There isn't one specific blood test for all skin infections. The type of blood test needed depends on the suspected cause of the infection. Here are some examples:
- For bacterial infections: A complete blood count (CBC) can show an elevated white blood cell count, especially neutrophils, which is a sign of infection. C-reactive protein (CRP) levels can also be elevated in bacterial infections.
- For fungal infections: A fungal culture test may be performed to identify the specific type of fungus causing the infection. This usually involves taking a sample from the affected area and culturing it in a lab. Blood tests are also used to diagnose more serious fungal infections.
- For viral infections: Specific blood tests are available for certain viral skin infections, such as herpes simplex virus or varicella-zoster virus (chickenpox and shingles).
- For tuberculosis: A tuberculosis (TB) blood test (IGRA) can detect if you have been infected with the TB bacteria. This test is a more accurate and easier alternative to the traditional TB skin test.
- For allergies: An immunoglobulin E (IgE) test can help identify specific allergens responsible for causing or exacerbating skin diseases like eczema.
It's important to consult with a healthcare provider for a proper diagnosis and treatment plan.
