Gout, though typically affects the great toe, can cause multiple
joint pain with rash. Hashimotos Thyroiditis is another possibility. Hayfever and rheumatoid arthritis too should also be ruled out.
Apart from these conditions multiple joint pain is seen in hypothyroidism, low Vitamin D levels, Low Vit B12 levels, anemia, osteoarthritis, SLE, electrolyte disturbance particularly those involving calcium and magnesium, parathyroid gland problems, chondrocalcinosis and chronic fatigue syndrome.