Six inducements making skin dark and spotted

Specifically, inducement causing skin black and spotted mainly is:

1. The arch-criminal-ultraviolet radiation;

2. Some sensitive food, such as animal liver and kidney, oyster, shrimp, crab, legume, walnut seed, currant and so on;

3. Drinking and smocking;

4. Some diseases;

5. Some medicine: quina, tranquillizer containing chlorpromazine;

6. External cause: rubbing skin hard when having wash.