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.
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.