I don't know if this is psoriasis caused by medication use

[stilltired]

This morning I noticed several small spots on my left buttock.  They looked like raised bumps but they don't feel raised.  They are all pretty round in shape, pretty light red (not bright red) and definitely weren't there before.  It's obviously hard for me to see it very well, but after contorting myself like a pretzel I could see about 4 of them about a quarter inch apart going in a diagonal row starting in the middle of the buttock and going toward the inner part of the buttock.  Then there is one far away from those at the very bottom of the buttock that appears to have white skin just at the very center.  There is nothing on the right side.  
I know it's not shingles because it doesn't hurt or burn and I haven't been sick recently, although I have felt a lot more fatigued. I think it might be psoriasis because about 3 weeks ago I started taking Plaquenil (hydroxychloroquine) for Lyme Disease and I've read it can cause skin problems, though it's supposedly rare.  

I know I have to see a doctor for a diagnosis and I am going to, but does this sound like psoriasis, and is there any over the counter treatment I can start until I can see a doctor?  Should I be concerned it will show up on other parts of my body?  

Anyone ever develop psoriasis from a medication, and if so did it still progress or remain after the drug was stopped?  I stopped taking Plaquenil today and my Lyme doc is prescribing something else, but it will really stink if I'm going to have psoriasis forever after only 3 weeks of a medication.  

[Dr_Aparna]

Hi,
This could be either psoriasis or a skin inflammatory re-action, both of which are seen with the usage of Plaquenil.
Unless you are directed to do so by your doctor, do not take Plaquenil if you have psoriasis (a recurrent skin disorder characterized by patches of red, dry, scaly skin) or porphyria (an inherited metabolic disorder affecting the liver or bone marrow). The use of Plaquenil may cause a severe attack of psoriasis and may increase the severity of porphyria.
Consult your doctor if you are taking a drug that has a tendency to produce dermatitis (inflammation of the skin), because you may have some skin reactions while taking Plaquenil.
ref:http://www.drugs.com/pdr/plaquenil.html
An allergy can affect any part of your body.So it might turn up in other parts too.
It is good that you have discontinued the usage of the drug.Medicated creams and ointments applied directly to psoriatic plaques can help reduce inflammation, remove built-up scale, reduce skin turn over, and clear affected skin of plaques. Ointment and creams containing coal tar, dithranol (anthralin), corticosteroids like desoximetasone (Topicort), vitamin D3 analogues (for example, calcipotriol), and retinoids are routinely used.
ref:http://en.wikipedia.org/wiki/Psoriasis