Which of the following is NOT a characteristic feature of psoriasis, aiding in its diagnosis?

Explanation: Psoriasis is characterized by red and raised skin patches covered with silver or white scales. These patches are often itchy and can be found on various parts of the body, such as the scalp, elbows, knees, and lower back.

Incorrect choices: a. Clear and smooth skin without any changes is not consistent with psoriasis, which is marked by visible skin changes like red, raised patches.

c. Skin rash with fluid-filled blisters may indicate conditions such as contact dermatitis or eczema but is not typical of psoriasis.

d. Purple or red lumps under the skin are more suggestive of other conditions, such as nodules or hematomas, rather than psoriasis.

Explanation: Psoriasis commonly presents as red, scaly, and thickened patches on the skin. These patches can be itchy, painful, and sometimes crack and bleed.

Incorrect choices: a. Smooth and pink patches on the skin - This is not characteristic of psoriasis, which typically involves scaling and thickening of the skin.

b. Flaky, white patches on the skin - This is not typical of psoriasis; the patches are usually red and scaly.

d. Raised, flesh-colored bumps on the skin - This description does not match the typical appearance of psoriasis patches.