Normal skin is neither too dry nor too oily and combination skin can be both dry and oily skin since the distribution of sebaceous and sweat glands is not homogeneous.

Sensitive skin is more prone to react to stimuli to which normal skin has no reaction. It is a fragile skin, usually accompanied by feelings of discomfort, such as heat, tightness, redness or itching.

Dry skin is generally characterized by a feeling of tightness and roughness. It may also acquire an ashy gray color, with occurrence of desquamation, itching, redness and small cracks.

Oily skin has a porous, humid and bright appearance. It is caused by excessive fat production by sebaceous glands, and usually determined by genetic and/or hormonal causes.