Pimples smell due to the bacteria within them producing sulfur compounds. These compounds, which often have a rotten-egg-like aroma, are responsible for the unpleasant odor associated with some pimples.
The Science Behind the Smell
Here's a more detailed look at why pimples can smell:
- Bacteria Involved: Acne breakouts are primarily caused by Propionibacterium acnes (now Cutibacterium acnes), a type of bacteria that thrives in the sebum (oil) and dead skin cells present in clogged pores.
- Sulfur Compounds: When these bacteria break down the sebum and other materials within the pimple, they produce various byproducts, including sulfur compounds.
- Odor Production: These sulfur compounds are volatile, meaning they readily evaporate and become airborne. This is why you can smell them. The reference notes that "when bacteria in your acne breakouts produce these sulfur compounds, it can result in your pimples having a distinct and often less-than-pleasant odor."²
- Why the Rotten Egg Smell? Hydrogen sulfide is a common sulfur compound and is responsible for the characteristic rotten egg smell. Other sulfur compounds may contribute to the overall unpleasant scent.
Factors Affecting the Smell
Not all pimples smell, and the intensity of the odor can vary. Here are some reasons for this:
- Type of Breakout: Deeper, more inflamed pimples are more likely to smell because they contain more bacteria and pus.
- Severity of Infection: A larger bacterial population will generally produce more sulfur compounds.
- Location of Pimple: Pimples in areas with more sebaceous glands (like the face, back, and chest) are more prone to smell due to higher oil production.
- Personal Hygiene: Regular cleansing can help reduce the bacterial load and therefore the potential for odor.
Understanding and Addressing the Smell
While a smelly pimple can be unpleasant, it is a normal outcome of a bacterial infection. Here's how to address it:
- Avoid Picking: Picking or popping pimples can increase the chance of infection and inflammation, potentially exacerbating the smell.
- Gentle Cleansing: Keep the affected area clean with a gentle cleanser.
- Topical Treatments: Over-the-counter treatments containing benzoyl peroxide or salicylic acid can help reduce the bacteria and inflammation.
- Consult a Dermatologist: If you have severe or persistent acne with a strong odor, consulting a dermatologist may be necessary for prescription treatments.
Summary
The reason pimples sometimes emit an unpleasant smell, particularly a rotten-egg-like odor, is due to the sulfur compounds produced by bacteria as they break down the contents of the pimple. By understanding this process, we can take measures to manage our breakouts effectively.
