Ticks are little parasites that do resemble a spider in someways, they bite you and start sucking the blood and its just not us they bite, they bite animals too. Initially they are so small you may not see one but as they start to eat they start to swell it is quite common for them to swell to a size of a pea.
They do not fly but tend to drop on you from branches and also crawl on you till they find fleshy part of you and start to feed, chances are they may feed for a day or two before you are aware you have been eaten by a tick. Once they have finished feeding they tend to drop off.
There is a chance that the tick could give you ‘Lyme Disease’ off course but if caught early and treated its is not a problem, it is only when its not detected that it becomes a health problem to a human.
Around 50% of people that have got ‘lyme disease’ will develop the classic ‘bulls eye’ type rash and not necessarily where you have been bitten either.