This is the 17762nd most frequent Russian word.
укусы
"Bites" (plural form).
The word 'укусы' refers to mosquito bites in this context.
На его руке было несколько укусов от комаров.
There were several bites from mosquitoes on his hand.
Here, 'укусы' indicates bites caused by spiders.
После укусов паука на коже появилась сыпь.
After spider bites, a rash appeared on the skin.
In this case, 'укусы' describes stings caused by bees.