Safe sex – sexual activity in which people take precautions to protect themselves against sexually transmitted diseases.

Salicylic Acid – is a monohydroxybenzoic acid, a type of phenolic acid and a beta hydroxy acid.

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Science – knowledge, as of facts or principles.

Skin – is a soft outer covering of an animal, in particular a vertebrate.

Skin Layers – is composed of three primary layers: epidermis, dermis, and hypodermis.

Skin layers

Signs – any objective evidence of a disease.

STD – are infections that you can get from having sex with someone who has the infection. The causes of STDs (sexually transmitted diseases) are bacteria, parasites and viruses.

Strain – an overstretching or overexertion of some part of the musculature.

Symptoms – any subjective evidence of disease or of a patient’s condition.

Synthesis – the combining of separate elements or substances to form a coherent whole.