Sorry about that. The reason your pimples are red and irritated is because bacteria is trapped inside and can not get out. A professional can do extractions and treat the bacteria while putting you on a home regimen to follow.
If this condition is bad with trapped ingrown hairs (hirsutism) you may have to have these hairs removed with electrolosis procedures which can be costly.
Ingrown hair is caused by cut/shaved hair rolling up under the skin most likely on your chin. The bacteria on the hair then causes inflammation and pain.