Precancerous lesion can be seen. Actinic keratoses usually go away by themselves. They are common in people over age 65. Since actinic keratoses are precancerous, they need to be treated. Histiocytoma is a pigmented bump often on the leg.
Milia are small spherical opaque white bumps.
Very smooth in outline. Basal cell carcinoma looks translucent and smooth but you can see ther is a bump there. Actinic keratoses are red and scaly and do not go away as fast as you expect a normal sore to go away. Squamous cell carcinoma is what some of the actinic keratoses develop into. It has fluid oozing out of its surface.