13cm erect, 5cm when flaccid - is penis filler okay to increase my length & girth?

Thank you for your question. Many men share similar concerns about size and sensitivity, so you are not alone in exploring possible options. Your current measurements (13 cm erect, 5 cm flaccid) are within the average range for adult men globally. Still, I understand that the goal of enhancement is often more about personal confidence than statistics.
For increasing girth, non-surgical dermal filler injections (such as hyaluronic acid) can provide visible thickening of the shaft. This procedure is generally well tolerated when performed by a qualified and experienced provider, using sterile technique and appropriate aftercare. Risks include temporary swelling, bruising, irregularities, infection, and—less commonly—vascular or tissue complications. These risks are significantly reduced when the treatment is done by a practitioner with expertise in male aesthetic procedures.
For increasing length, fillers will not meaningfully change the erect length, but some procedures can improve the visible length in the flaccid state. Options may include ligament release surgery or reduction of the pubic fat pad (via liposuction or surgical lift). These are more invasive and carry higher risks, including scarring, changes in erection angle, and variable results. Any surgical lengthening procedure should be carefully weighed against its potential complications.
Enhancement procedures are not designed to increase sensitivity; in some cases, fillers may temporarily alter sensation due to swelling or changes in skin tension. If sensitivity changes are significant or bothersome, a thorough evaluation by a healthcare provider is recommended before pursuing any cosmetic procedure.
In summary, girth enhancement with fillers can be safe in expert hands, but it will not substantially lengthen an erection or directly improve sensation. Your first step should be a consultation with a board-certified urologist or cosmetic physician who has extensive experience with male genital procedures, so you can discuss your goals, possible treatments, and realistic expectations.
Disclaimer: This information is for general educational purposes only and should not be taken as personal medical advice. Every individual’s anatomy, goals, and health history are different, and only an in-person consultation with a qualified medical professional can determine the safest and most effective approach for you.

I have written a few papers about penis enlargement, augmentation phalloplasty, and evidence-based outcomes. Safety is always the priority. Here are some links to the papers:
Penis enlargement surgery can offer modest improvements in both length and girth, but there are risks and limitations that should be carefully considered. Always go to an experienced provider. Complications can be devastating.
Lengthening Surgery: The most common method involves cutting the suspensory ligament that attaches the penis to the pubic bone, which can result in an increase of about 1 inch in flaccid length. However, this may not significantly affect erect length. Additionally, some men experience a "drooping" effect where the penis no longer rises in erection, but instead points downward.
Girth Enhancement: This can be achieved through fat grafting (using the patient’s own fat) or the insertion of dermal fillers or collagen-based materials. These techniques can add circumference, though fat grafts may have issues with uneven absorption, and synthetic fillers can lead to complications like infection, ulceration, or extrusion. The use of Alloderm (a type of cadaveric tissue) has been controversial due to risks of tissue reabsorption or complications.
Minimally Invasive Alternatives: Non-surgical treatments, like platelet-rich plasma (PRP) injections or fillers, are also options for improving penis girth and overall appearance. These methods generally have shorter recovery times and lower complication risks compared to surgery. Fillers tend to increase girth, and increase flaccid length minimally due to the extra weight.
While surgery can lead to some visible improvements, the results may not meet all expectations, and the risks of complications are significant. For those seeking a modest increase in size, non-surgical options may offer safer alternatives. Consulting with an experienced surgeon is essential to determine the best course of action.
Krishna Vyas, MD, PhD, MHSHarvard, Hopkins, & Mayo Clinic Trained Aesthetic Plastic SurgeonNew York, New York

Penis fillers such as bellafill, radiesse, voluma stimulate collagen production and volumize the penis. The result is an increase in penile girth but none of the bio-stimulator fillers mentioned above increase penile length.

The Girth Shot that I perform will certainly increase girth in your situation, but it doesn't have any significant effect on length when erect. It does increase the length somewhat while flaccid, due to the filler having a little weight to it.

Fillers can increase the length of the penis when flaccid but it cannot increase the length when erect. The only way to increase the erect length of the penis is by a minor surgery to detach the suspensory ligaments of the penis. This is a safe procedure when done by an experienced surgeon.
For more information visit my website at BayAreaPenisEnlargement.com or call my office at 650-697-8888