If you can be certain your razor is
well-honed (sharp!) and if it is not the blade, then the source of the irritation is probably
technique.
Razor burn is an irritation to the skin usually caused by a dull or blunt blade edge or improper technique. Some of the likely culprits:
Improper blade angle, dry shaving (not enough moisture or lubrication), too much pressure, shaving
too quickly, too many passes in one area.
When learning to use a straight razor, it is also important to
stretch the skin being shaved. Many beginners tend to overdo the amount of razor strokes
in one area, trying to adjust to the awkwardness of maneuvering the blade. Too steep or too shallow an angle can also aggravate the skin.
Usually nothing greater than a 30° angle is preferred for a comfortable SR shave. Greater than 30...45 to 90° can lead to scraping of the skin = irritation. Find the proper comfortable angle takes a bit of practice. This illustration has some 'recommended' angles to efficiently mow down the hair and minimize irritation:
I find, particularly with the upstroke on the throat, the 5 to 15° angles work best for me, where the blade is
nearly flat—but not quite— on the skin in some areas. Remember: We're slicing hairs here, not
chopping them.
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