This is very common. Nothing to worry about. The soft skin usually becomes irritant to razor and causes furunculosis. Apply prikly heat powders or any anti biotic ointmemts like neomycine or sofradex ointment. This will go away in a few days time. Next time planning to do so make sure that you moisten the area well and use shaving cream.
Next Steps
keep dry, use powder. use antibiotic ointment
Health Tips
applying ice on the red eruptions will help