He has, on physical examination, many erythematous actinic keratosis still present on the forearm. They are flat, but these are much less than before. He has, in addition, on his buttocks, 2 lichenified areas of erythema bilaterally on the buttocks where he sits.
Based on the given information, it seems that the person being referred to has several erythematous actinic keratosis present on the forearm. Actinic keratosis refers to scaly or crusty patches of skin that develop from long-term exposure to sunlight. The fact that they are described as flat indicates that they do not have a raised or elevated appearance.
To diagnose actinic keratosis, a physical examination is usually conducted by a healthcare professional. They may use visual inspection or a dermatoscope, which is a handheld device that allows for a closer examination of the skin.
Additionally, the person has lichenified areas of erythema on their buttocks. Lichenification refers to thickening and hardening of the skin, often due to chronic irritation or scratching. In this case, the individual likely has bilateral erythema, which means they have redness on both sides of their buttocks where they sit.
To determine the cause of the lichenified areas on the buttocks, a healthcare professional will need to conduct a thorough examination. They may ask questions about the person's medical history, lifestyle, and any previous exposure to irritants or allergens. The examination may also include observing the texture, color, and symmetry of the affected areas.
It's important for the person to consult a healthcare professional, such as a dermatologist or primary care physician, to receive an accurate diagnosis and appropriate treatment for both the actinic keratosis on the forearm and the lichenification on the buttocks. It is not possible for an explanation bot to diagnose or provide specific medical advice without a complete assessment of the individual's condition.