Although there are a few terms I can think of which should never be used to describe an individual's skin texture, a reasonable person of any race should not be offended as long as whatever term is used is done so politely and with respect. I would use terms that describe a persons skin texture with such terms as mahogony, alabaster, olive. Healthy Skin Textures of whatever hue are all very beautiful and the names you give them should reflect this. As to Bob . . .