The anatomy of the skin : video

* What is the function of melanin ?
* What are the contents of the derms ?
* What is the function of subcutaneous tissue ?

Mechanism of action of botulinium toxin (botox) : video

* How does the toxin enter the nerve cell ?

* How does the toxin block the nerve and what is the meaning of nerve sprouting ?

* Why does the toxin should be reinjected from time to time ?

*What is the relationship between acne and sebaceous gland, sebum & comedos ?

* What do you know about acne causes, acne treatment, & acne sites on the body?

* Sometimes comedos become with white heads and sometimes with black heads.Why ?