1. General diagnostic methods
1) History-taking
2) Inspection and palpation
3) Olfactory examination

2. Photosensitivity test
1) Photo test
2) Photo-patch test
3) Photo-drug test

3. Allergy test
1) Patch test
2) Scratch test
3) Intracutaneous (type I allergy test, type IV allergy test)
4) Drug-induced lymphocyte stimulation test (DLST)
5) Drug challenge test

4. Skin function test
1) Measurement of skin temperature and thermography
2) Transepidermal water loss (TEWL)
3) Skin capillary resistance test

5. Fungal examination
6. Dermoscopy
7. Diascopy
8. Needle reaction test
9. Wood’s lamp test
10. Cytological diagnosis (Tzanck test)
11. Dinitrochlorobenzene (DNCB) test
12. Dermographism
13. Darier’s sign
14. Sensory test
15. Nikolsky phenomenon
16. Köbner phenomenon
17. Auspitz phenomenon
18. Enzyme-linked immunosorbent assay (ELISA)
19. Western blot
20. Diagnostic imaging
21. General internal medical tests
22. DNA analysis