In young birds the gape is very soft and noticeable but in a fledgling it begins to harden somewhat, become less prominent, and--like the bill itself--darken with age. (In some bird species--Purple Finches, for example--the adult retains a yellow gape, albeit smaller and less obvious.)
Psoriatic Arthritis. Psoriasis is a skin disease in which patients have dry, red and scaly skin rashes that can occur on any part of the body. Between 5-20% of patients with psoriasis may develop an associated arthritis. Arthritis means inflamed joint.
Not everyone who has psoriasis will get psoriatic arthritis, even though the conditions are often related. Psoriasis causes patches of scaly, red, or white skin called plaques. Psoriatic arthritis sets off joint swelling and pain that can lead to permanent damage. Your immune system is responsible for both. Inflammation is part of both psoriasis and psoriatic arthritis.