Why does skin become oily in humid weather?


Temperatures and humidity levels increase in the summer. These changes in the atmosphere cause the sebaceous glands to produce more sebum. This creates unwanted facial oiliness.

Sebaceous gland

Sebaceous gland produce sebum, an oily secretion which makes the hair and the outer surface of the skin oily and waterproof to keep the epidermis supple and to prevent water loss by evaporation.

Functions of sebaceous gland

The functions of sebaceous gland are

  • Sebum waterproofs and lubricates the skin and hair of mammals.
  • They secrete an oily, wax substance known as sebum.
  • Sebaceous glands are usually attached to hair follicles and release a fatty substance.
  • Sebum lubricates the skin to protect against friction and makes it more impervious to moisture.

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