Our expert says:
Yes is can reappear if the hole you made was small, and it closed up before all the pus drained out. Saliva won't really burn but I would not add more germs to a pimple by treating it with saliva! Best is always to open up a yellow pointed pimple with a sterile needle ( wipe it with alcohol or spiritus) and to put antibiotic ointment or cream like Bactroban on it afterwards. If you squeeze a pimple you bruise the skin and cause more chance of infecting the surrounding skin and making ugly scars.
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