<s>[INST] what can cause red pimple spots like little scaly soar no pus and come in your inside of your jaw and on tip of tongue. I was told I had rheumatoid arthritis/ lupus with psoriasis. The only thing I was given at the time is some methotrexate, it did no good. [/INST] Hi.Thanks for the query..Your symptoms are appearing like those of mouth sores or mouth ulcers..It can be due to a number of causes like Vitamin B 12 and iron deficiency, eating plenty of sour or spicy foods, tobacco chewing habits, any sharp cusps of teeth causing mucosal injury etc.So my suggestion is to start gargling with warm saline solution.Avoid spicy and acidic foods..Take Vitamin B complex supplement daily..Do soda bicarb rinses.If there are any sharp cusps of teeth get them.smoothed..Drink plenty of cool water..Hope this helps..Regards.. </s>