Hi,
You could be having an acne or pimple at the site.
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.
Well I had one on my right lip on the border of my lip and skin, and it was pretty red and it was a white head. After a few days I got sick of it and popped it, and then washed my face and put some neosporin, so it wouldn't get infected, and now it's healing.