1. Skin biopsy: This involves the removal of a small piece of skin tissue for microscopic examination. It helps in diagnosing skin conditions like skin cancer, rashes, infections, or autoimmune disorders.

2. Patch testing: This test is performed to identify allergic contact dermatitis. Small patches containing different allergens are applied to the skin and observed for any allergic reactions after a specific period.

3. Wood’s lamp examination: It uses a specialized ultraviolet lamp to examine the skin under ultraviolet light. It helps in diagnosing conditions like vitiligo, fungal infections, and certain pigmentary disorders.

4. Skin scraping or swab test: This test involves taking a sample of skin cells or material from the affected area for microscopic examination or culture to identify the presence of fungal or bacterial infections.

5. Allergy testing: Various tests are available to identify allergens causing allergic reactions on the skin, such as prick tests, intradermal tests, or blood tests like specific IgE assays.

6. Patch phototesting: This test is done to evaluate photosensitivity or light-induced skin reactions. Small patches with different photosensitizing agents are applied to the skin, which is then exposed to controlled amounts of ultraviolet light.

It’s important to note that the specific tests recommended may vary depending on the dermatologist’s assessment and the individual’s symptoms and condition. It’s best to consult a dermatologist who can recommend the appropriate tests based on the specific situation.