I have regular pimple and. Pimples turn to dark...

Acne treatment :
1. consult a dermatoglist doctor to do the needed medical examnation and determine the treatment pathway
2. have a healthy life style , including : healthy diet , exercise , sleep and rest well
3. avoid stress 
4. usually doctor starts treatment therapy by topical antibiotics such as erythromycin
5. if topical treatment isnt effective , doctor may prescribe oral medication such as doxycycilin and isoterinoin
6. you can use laser therpy later after to renew your skin layer and get rid of unwanted hair 
- to avoid the black spots after acne , you can use vitamin A derivatives such as : adapaline - once daily at night
Food to avoid while treating acne :
1. chocolete 
2. bread and heavy carbohydrate food such as chips 
3. oily food 
4. condiments and spices 
General advices to treat acne :
1. avoid smoking and alcohol 
2. sleep well and at night 
3. get rid of hair around the acne area ( better to use laser treatment )
4. use a combination of treatment therpy such as oral and topical medications , as well as using cosmatic products that helps your case 
Acne causes :
1. infection
2. stress 
3. some types of food and medications 
4. smoking is a risk factor 
5. oily and hairy skin 
Needed medical examnations :
1. physical examnation by doctor 
2. bacteria culture