[Image- Itchy, scaly ring shaped eruptions!]
This is the description of what you have on your groin (inner thighs), hand, face, ear and other areas and this is commonly known as Ring Worm. However, this is not a worm infestation.
You now know that it is happening very commonly in your house, neighbours, friends, classes and where not.
This ia fungal infection. Due to rampant use of over the counter steroids, incomplete therapy, applying anything and everything that have been suggested and negligence of all, fungal infection has become resistant to even the best drugs.
Very unfortunate and troublesome situation.
Consult a dermatologist immediately when you notice this.