
ritzen
to scratch
To cut or engrave a superficial, narrow line or scratch into a surface.
Er ritzte seine Initialen mit einem Messer in die Baumrinde.
He scratched his initials into the tree bark with a knife.
to scratch / to cut
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to scratch
To cut or engrave a superficial, narrow line or scratch into a surface.
Er ritzte seine Initialen mit einem Messer in die Baumrinde.
He scratched his initials into the tree bark with a knife.

to self-harm
To intentionally injure one's own skin superficially with a sharp object, often as a form of self-harm in connection with mental health problems.
In der Therapie lernte sie, mit dem Drang, sich zu ritzen, anders umzugehen.
In therapy, she learned different ways to deal with the urge to self-harm.
The meaning changes completely depending on whether the verb is reflexive or not. 'Sich ritzen' (to self-harm by cutting/scratching oneself) almost always refers to self-harm, while 'etwas ritzen' (to scratch/engrave something) describes engraving or scratching a surface.
Sie ritzte ein Herz in den Sand.
She scratched a heart into the sand.
When engraving or scratching a surface, the structure 'etwas (accusative) in etwas (accusative) ritzen' is often used. The first accusative object is the sign or mark, and the second is the surface.
Die Kinder ritzten ihre Namen in den alten Holztisch.
The children scratched their names into the old wooden table.
The reflexive form 'sich ritzen' (to self-harm by cutting/scratching oneself) is a very serious and sensitive term from the field of psychology. It describes a form of self-harm and should be used with care.
Psychologen helfen Jugendlichen, die sich ritzen.
Psychologists help teenagers who self-harm.
to cut
Sich schneiden refers here to an accidental injury caused by a sharp object. Sich ritzen, on the other hand, refers to intentionally causing a usually superficial injury to one’s own skin. The decisive difference is therefore whether the injury is accidental or intentional self-harm.

Lea erzählt ihrer Therapeutin, dass sie sich absichtlich am Arm ritzt.
Lea tells her therapist that she intentionally cuts her arm.
Beim Öffnen der Verpackung schneidet sich Lea versehentlich am Finger.
Lea accidentally cuts her finger while opening the package.