blemish going on 3 monhs

SO happy to have discovered this site... Anyway, about three months ago I got a blemish, lesion..(??) on my chin. Assuming it was on my chin, and I have a bunch of tiny white comodones on my chin always, anyway, I didn't think too much of it.. I get a zit every now and then, still.. (at 35). I started doing what I normally do when I get a zit.. use stridex pads, resort to my past prescribed medications -Clindamycin Phosphate and Tretinoin Cream.. 2, 3, 4 weeks later.. no improvement. I scheduled a Dermatologist Apt. (but of course that took 4 weeks to get in) and when I did, the dang Dr. tells me. "It's in the acne family.. just keep using what you are and I'll also give you a prescription for an oral medication." (Doxycycl) WELL.. Its been a month now since that appointment and 3 medications and 3 months later, I still am dealing with this thing. I told the Dermatologist, I didnt think this was acne! There is no creamy white puss, it's just like- raised skin that keeps scabbing over, about the size of an earing back. I squeeze and nothing somes out.. I'm beyond frustrated and getting a second opinion at the end of this month (March 2013) wth another doc.. but if this appointment is anything like my last one, its just going to be another waste of money with no improvement. Has anyone experieinced anything similar to this -whatever it is- blemish? lesion? Ive read everyone talking about the incredible affects of Calomine, so I went out and bought some last night and just put my 3rd application on, as I type this. Too early to tell if it will work, but its worth a try. I'll keep you all posted,but I dont think my issue is just healing of it being picked at, I think its something I need to treat and haven't been given the correct treatment. Any input is much appreciated! Thanks~!! : )