This product typically refers to a specialized skincare treatment designed to manage breakouts and their lasting marks. While multiple brands offer “Acne & Dark Spot Corrector” serums in a 30 ml size,  are prominent examples formulated specifically for oily and acne-prone skin. 

Key Benefits for Oily Skin
Sebum Control: Formulated to stabilize oil production and minimize the appearance of large pores.
Fading Marks: Targets post-inflammatory hyperpigmentation (PIH) and stubborn acne scars.
Brightening: Helps even out skin tone and restore a natural glow without being
greasy. 

Common Active Ingredients
Most 30 ml corrector serums for oily skin include a combination of these ingredients: 
Niacinamide (Vitamin B3): A “multi-tasking” brightener that strengthens the skin barrier and controls oil.
Salicylic Acid (BHA): Gently exfoliates and unclogs pores to prevent future breakouts.
Tranexamic Acid / Alpha Arbutin: Potent agents that inhibit melanin production to fade existing dark spots.
Zinc PCA: Often paired with Niacinamide to further regulate sebum and combat acne-causing bacteria