Different Types of Acne

1.  Acne vulgaris - most common type of acne; usually begins 

     during puberty 
2.  Chemical acne - caused by exposure to certain chemicals 

     and oils 
3.  Chloracne - caused by exposure to chlorinated hydrocarbon 

     chemicals 
4.  Tropical acne - caused by hot and humid conditions; often 

     occurring in young Caucasians who are unaccustomed to 

     these conditions