Your condition requires attention. I would recommend you see your primary care doctor
in order to have this evaluated. In addition, a dermatologist
, or skin specialist, can also be of help.
In general, acne
can occur in various distributions on the body. Acne, or as its medically known: acne vulgaris, occurs when the sebaceous glands -- the glands that secrete sebum to lubricate the hair and skin -- become clogged. These clogged pores can become inflamed and thereby produce pimples. Pimples can subsequently become infected and develop pus drainage and crusting. It often as a cyclic pattern of coming and going. What you describe could be acne. In fact, it is the most common skin condition in women your age, so statistically this is makes sense.
That being said, there are other things you should rule out. Impetigo is a skin infection that can develop crusts. Untreated (normally with antibiotics) this can cause significant problems such as bacteria in the plug.
Other common skin problems include allergic reactions. Are you using a new necklace or cream?
Other skin conditions include eczema or psoriasis. A dermatologist can evaluate this.
I would encourage you to talk to your doctor. This should be evaluated for both diagnosis and treatment.