In my bra area it almost looks like ringworm. Psoriasis is a chronic, recurring disease with silvery bumps and plaques of various sizes. An abnormally high rate of growth and turnover of skin cells causes the scaling. It is thought that an immune mechanism plays a role in this rapid cell growth but the cause is unknown. It often runs in families.
Psoriasis usually starts as one or more small red plaques that become excessively flaky.
Some may remain thumbnail size, but others may grow to cover a large area of the body, sometimes in striking ring-shaped or spiral patterns. This condition typically involves the scalp, elbow, knees and back. In addition to the medications you mention, ultraviolet light also is used. The regime of therapy you have been on should result in improvement. Work closely with your physician for the best combination of drugs and creams.