Une las parejas. 1. una picadura de mosquito una pomada 2. algo que se rasca sale una roncha 3. algo que evita un sarpullido sarpullido

1)Una picadura de mosquito -- una roncha

2) algo que se rasca --- Sarpullido

3 )algo que evita un sarpullido -- una pomada

Explanation:

The things we have are:

Una picadura de mosquito                 una pomada

algo que se rasca                                 una roncha

algo que evita un sarpullido               sarpullido

Now, we need to link the couples.

"una picadura de mosquito" means "a mosquito bite", and the right word that goes along with it is "una roncha" that means something like "a rash"

"Algo que se rasca" means "something that scratches", and the word that goes along with this is "sarpullido" that means "rash"

The last couple is "algo que evita el sarpullido", which means "something that avoids the rash", and the word that goes whith it is "una pomada", which means "an ointment"