Could be a sebaceous cyst. With any unusual manifestation on the skinn, there is always a concern of skin cancer. Go to your dr or urgent care and have it checked.
Hi,
You could be having an acne or pimple at the site. You should avoid tanning till you consult your skin specialist.
There are several treatment options available for acne - topical application creams, oral medications, laser treatment etc.
It would be best to consult your dermatologist to decide about the best treatment option in your case.
Comedonal (non-inflammatory) acne: local treatment with azelaic acid, salicylic acid, topical retinoids, benzoyl peroxide.
Mild papulo-pustular (inflammatory) acne: benzoyl peroxide or topical retinoids, topical antibiotics (such as erythromycin).
Moderate inflammatory acne: benzoyl peroxide or topical retinoids combined with oral antibiotics (tetracyclines). Isotretinoin is an option.
Severe inflammatory acne, nodular acne, acne resistant to the above treatments: isotretinoin also known as Accutane, can be prescribed by a doctor, or contraceptive pills with cyproterone for females with virilization or drospirenone.
http://en.wikipedia.org/wiki/Acne_vulgaris#Treatments
Let us know about how you are doing and what your doctor advises.
Post us if you need any further information.
Regards.