From the way you have expressed your complaints, the problems you have is infected acne
. As it may produce scar don't scratch it.
It is common during the adolescent period, due to hormonal
As it has occurred only in the ear it can also be a boil.
But the treatment for both the conditions are almost same.
Simple application of an antibiotic cream like clindamycin
cream + oral antibiotic + anti inflammatory drugs are enough to cure.
Avoid all allergic substances including allergic soaps