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“Ticks are probably the ones to be most worried about because they have the ability to transmit Lyme disease, Rocky Mountain spotted fever, and other diseases,” Levine says. Ticks are common throughout the country and they live in grass, trees, shrubs and leaf piles. Most tick bites are harmless. Sometimes there are no symptoms and other times you may feel pain, swelling, a rash, burning sensation, and even blisters.