Symptoms:
There are six main types of spot caused by acne:
Blackheads are small black or yellowish bump that develops on the skin. Whiteheads are firmer and will not be empty when squeezed. Papules are small red bumps that may feel tender or sore.
Treatment:
A laser procedure called photodynamic therapy which includes chemical skin peeling, removal of scars by dermabrasion, or removal, drainage, or injection of cysts with cortisone. Antibiotics may help some people with acne.
For more information visit the following websites
http://www.aad.org/dermatology-a-to-z/diseases-and-treatments/a---d/acne