why this ?

Sunny
Woke up this morning to see a spot on my arm, which is very itchy, hubby look at it and said could be a bug bite, oh I strip the bed to check if it was bed bugs but out bed is clear thank God,should it to my nurse friend she said it's ring worm oh lord I just skin rash etc 
I bought an over the counter Meds I hope it works if not  plan on going to my dermatologist 
What would you recommend for ring worms ?