Hi, welcome to justanswer , there are many possibilities in your case.

This red itchy bump could be product of local irritation , an infectious process ( viral , bacterial ,fungal or parasite infection ) , an allergic process , scabies( a parasite skin infection that burrows under the skin), folliculitis ( this is an infection of the hair follicles ,it is usually caused by a Staphylococcus bacterial infection), a bug ,insect or flea bite.


What I would recommend you would be to consult a doctor immediately ( go to the emergency ) if you experience additional symptoms like purulent secretion, the lesion becomes painful , you experience swelling or other symptoms like fever , chills ,joint pain , body aches or generalized fatigue .

What you could try in the meantime is applying warm compresses, you could get an over the counter hydrocortisone cream or calamine lotion to decrease the itchy sensation and apply an over the counter topical antibiotic cream like neosporin ( it contains neomycin ,polymyxin and bacitracin ) to the area .

If your symptoms do not improve within a period of 5-7 days , you will need to consult a doctor for a further medical evaluation and to receive a more specific treatment .

If you sustained any type of injury while you were rock climbing ,you should go to the doctor to see if you will need to receive a tetanus shot .

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