my son had a bad dose of the chickenpox before the summer, just kept him in very loose clothing and used camomile lotion on his skin as well as piriton to stop the itching.
The doc said to watch out for his eyes too as he would need drops if they developed within his eyelashes, he did have spots on his eyes but they were not close, they spread like wildfire dont they!? as I was looking at him more and more were appearing..
And watch out sometimes for high temperatures.. his went up quite high, used Calpol to stabalise it!
That was back in the beginning of July and he still has the spots now on his belly and back, I think they may have scarred.
Also, as its just me and my little boy (sometimes I wish I had someone else to get up to him! ) I slept by the side of his cot for over a week just gently rubbing his back as he whimpered in his sleep as they itched so terribly. He had what seemed like a cold, and was also very grumpy.
The whole process from seeing the first spot to them all blistering took him 2.5 weeks.
A story my dad told me, he is one of ten children (8 girls and 2 boys - argh!) was that when they were younger people used to have chickenpox parties, once one kid got it they were all put in the same room and mums n dads dealt with all of them over the next few weeks! then it was over and done with!
Theres nothing you can do to prevent it, especially if like mine, they go to nursery - they catch everything.. makes you wonder if its worth sending them at all sometimes as Ive been through stages with him that hes only been there for a couple of days a month due to a bug he's caught! and then theres the money, its hard paying for them even though there not there isnt it!
sorry to ramble, hope this helps someone..