What Kind of Doctor Do I Need? Slideshow Dental (Oral) Health Quiz Causes of a Heart Attack Slideshow Subcutaneous: Under the skin. For example, a subcutaneous injection is an injection in which a needle is inserted just under the skin. Also known as subcu. Abbreviated subq. From Healthy Resources When Prostate Cancer SpreadsHow Well Are You Living With AS?Protecting Your Immune System Featured Centers How Is Your MS Care Routine? Assess Yourself Health Solutions From Our Sponsors Kept Your Wisdom Teeth? What is TAVR?