It is used in products such as Vicks VapoRub. Camphor is applied to the skin to relieve pain and reduce itching.It is also applied to the skin on the neck and chest so that it can be breathed in to reduce the urge to cough. 

Camphor belongs to the class of medicines called rubefacients/antitussives. When applied to the skin, it increases blood flow and local temperature of the affected area which suppresses and temporarily relieves pain sensations. It also eases cough, nasal/throat irritation by moistening air passages when used along with steam.

Major & minor side effects for Camphor

• Skin Irritation
• Hypersensitivoty
• Irritation of ear
• Allergic skin rash

Do not use it on broken or injured skin as the body could absorb too much amount causing toxicity.

Do not use it if you are pregnant or breastfeeding.

It should never be taken orally as this can cause serious side effects.

• Salicylic acid is a keratolytic (peeling agent). Salicylic acid causes shedding of the outer layer of skin.
• It treats pimples (acne) by penetrating into the skin and killing acne-causing bacteria. It additionally reduces oil production in the skin, replenishes acne-prone skin, and it also keeps your pores open.

Salicylic acid topical (for the skin) is used in the treatment of acne, dandruff, seborrhea, or psoriasis, and to remove corns, calluses, and warts.

• Skin irritation,
• Hypersensitivity,
• Dry skin,
• Erythema (skin redness)

• This medicine should not be used to treat genital warts, warts on the face, warts with hair growing from them, warts in the nose or mouth, moles, or birthmarks.
• It makes your skin sensitive towards sunlight. Use protective measures like sunscreen or wear protective clothing. 
• Inform your doctor if you notice unusual dryness, redness and peeling of the skin.
• Do not apply to open wounds or irritated skin.