Why Pus formation is still continued?

Many times after the surgery the wound does not heal properly and takes time for drying up. To facilitate the wound drying the doctor will prescribe some antibiotics and other medicines and in most of the cases within a week or so the wound dries up. If it is not happening then the most common doubt is some small cotton gauge or a part of it or any such foreign material still lying in the area of operation and that can delay the wound healing and in all the probability the wound has to be opened up, cleaned thoroughly and then again to be closed with all the precautions. These type of things are very common in medical surgical practices as even a small outside material remains there, it can start pus formation and then it has to be removed surgically. So it is better to ask the doctor about it and take his opinion as whether it can be dried with a longer antibiotic treatment or the wound is to be reopened for cleaning and washing with the usual medical liquids to disinfect the place thoroughly to avoid pus formation. Talk to the surgeon and ask his advice in the matter. If you have some doubt on any process or procedure adopted in the operation you can take an opinion of the other surgeon also in the matter which will make you comfortable for going ahead in the matter.

After the surgery, it has been observed the wound heels up in their own way but the doctors take the recourse of antibiotics to expedite the heeling process. These antibiotics are well tolerated and are prescribed by the doctors after examining the patients.
In your case, though the course of antibiotics was followed, but the results are not encouraging. The following points need to be considered -
1) The antibiotics prescribed by the doctors should be taken in time and any deviation of the time - schedule will cause less working of medicine but if such a negligence has taken place frequently during the course of taking antibiotics, it may not work at all. In that case, you meet your doctor/ surgeon for the review of the medicine and if needed, he would change the medicine after examining your wound.
2) If there is elevation of blood sugar beyond the normal range, the healing process gets delayed. You may confirm the same after getting your blood sample tested in relation to your sugar level in the blood.
3) Sometimes, it happens that some foreign materials are stuck up and is lying in the operated region. This would be needed to be removed after thorough dressing. Hence a further consultation of the doctor is needed.
4) In case, you are not getting positive results after two or three sessions of your doctor, take an appointment of other reputed specialist.

Sometimes Surgery can lead to a wound infection after surgery. The infection to the surgical wound may appear within 30 days after surgery. When this infection appears we should contact the doctor and follow his instructions for getting cured.
Surgical wound infections will lead to pus draining. It can be in red or yellow in colour, painful or hot to touch. Sometimes you may have some fever also and feel sick.

Surgical wounds can become infected because of the following reasons.
1, Germs existing on your skin can spread to the surgical wound
2, Germs in your body or the organ on which the surgery was performed
3, Germs in the environment. Germs may be there on surgical instruments or on the hands of the health care provider.
If you have any of the following problems the surgical wound infection will very serious sometimes.
1, Diabetic problem
2. Poor immune system
3. overweight
4.. Smoking
These wounds can be at different levels.
1. The infection in the skin area only
2, The infection that is deeper than the skin
3. The infection that is deep and the organ and space where the surgery is also involved.
Generally, doctors will prescribe some medicines especially antibiotics. Sometime the antibiotics may not work effectively and pus will continue. In your case probably the antibiotic the doctor has given may not be responding. You can go to the doctor and he may perform a culture test and suggest an alternative antibiotic.
The problem may be also due to some foreign items like cotton or gauze cloth or something similar might have been stuck to the wound. These materials can be removed and dressed up. Sometimes that should be removed by performing surgery also. So you should go to the doctor again and get his opinion.
I feel you can go for a second opinion also and get proper treatment.

Healing of a wound or surgical wound takes different time in different people for healing depending on the biochemical rate of chemical interaction in the individual body. But it will not differ so much as mentioned by you in your query. In all probability this infection would be due to not adhering to the special cleaning and hygiene aspects that are to be followed in an operation. So we cannot blame any surgeon for it but these are practical things and such lapses are possible when surgeries are done. Even if the cotton and surgical tools used in the operation are not properly and thoroughly sterilised then also such mishaps can occur. So it would be better to talk about these possibilities with the surgeon in a frank and fearful manner because you have paid for the service and you are supposed to get a trouble free operation process. If the doctor does not support you then it would be better to go to some good and reputed surgeon for the second advice.

Are you sure that the doctor who treated you and performed the appendicitis surgery is a properly qualified, experienced and authorised person to do such surgery?
Usually doctors display their registration number on their letter heads and prescription papers. The prescription paper you does not have registration number.
It gives rise to a normal doubt that things were done in a non-professional manner.

Though in some small fraction of cases such pus or abscess formation can happen post surgery, nowadays experienced, qualified professional medical doctors factor these issues and give proper anti-biotics or other medicines to prevent and avoid any such post-surgery issues and trauma.

Doctors generally advise the patient about the Dos and Don'ts after surgery at least for the immediate week or two.

I suggest you immediately visit another established reputed hospital near your place and get treated before things turn worse.