If you remember my talk on Unpleasant Physical Sensations. I talk about itches helping our practice. What do you want to do with the next itch you have while you are sitting in meditation? Do you want to scratch it or are you going to try to use that technique and feel it as a sensation, try to note it, feel it as a sensation, observe it. Watch the tingling, watch the irritation, watch the part of the mind also that wants it to go away. Can you use the Unpleasant Physical Sensation technique for itches? If you can't work with itches, and you always want to scratch them, you are going to have a harder time with mosquitoes, you are going to have a harder time with other little physical pains and you are going to miss something that is very valuable.
We have been talking quite a bit about death, the last moment at death. If your death is painful how are you going to try and control your mind? If you can't work with an itch how are you going to work with intense physical pain? So take the itches on as a challenge, as just one of the low-level Unpleasant Physical Sensations that we do want to be able to work with. We do want to be able to sit and observe an itch. If we can do it with the itch, then we have a better chance to do it with the mosquito bite, the ant bite, whatever other bite comes. We have a better chance with the broken leg, the broken arm, we have a better chance ultimately if we get beat up and murdered, and so on. So, take on itches and insect bites, take them on as a good challenge in the practice.